设置默认值

@@ -321,6 +321,9 @@ RCT_EXPORT_METHOD(pay:(NSDictionary *)data
                                      completionBlock:^(NSError *error, UIImage *image) {
             if ([aData[@"LimitLength"] integerValue]!=0) {
                 [image compressWithLengthLimit:[aData[@"LimitLength"]integerValue]*1024.f];
+            }else
+            {
+                [image compressWithLengthLimit:32*1024.f];
             }
                                          [self shareToWeixinWithData:aData thumbImage:image scene:aScene callBack:aCallBack];
                                      }];